• Chemical flocculants may be used to assist the removal of suspended solids from the stormwater. [RM975261 Sch 1 (39).]

• Flocculent use must be in general accordance with the York Valley Landfill Chemical Treatment Management Plan (CTMP) (appendix C of the ESCP Rev B prepared by Southern Skies and dated August 2024. [RM975261 Sch 1 (40).]

• The CMTP sets out:

  • The flocculation system design.

  • Dosing methodology.

  • Monitoring and maintenance requirements.

  • Record keeping instructions and templates.

  • Storage and transportation.

  • Contingency plans for spills.

• The CTMP permits the use of batch dosing of flocculent under certain conditions.

• Batch dosing of stormwater may be permitted if sediment laden runoff has to be discharged within 48 hours because the pond is full.

• However, because of the effect of flocculent on the pH of treated water, careful monitoring of pH is required when batch dosing.

• The dose rate, application methodology, mixing requirements, timing, and monitoring requirements are set out in the CTMP.

[WN - Can we remove this condition, site is secure?]

[RM975261 Sch 1 (41).]

[RM975261 Sch 1 (42) & (43).]

• clean up the spill as soon as practicable, inspect and clean the spill area;

• take all practicable measures to prevent a recurrence; and

• inform the Council's Monitoring Officer within 24 hours of a spill event and provide the following information:

  • the date, time, location and estimated volume of the spill;

  • the cause of the spill;

  • clean-up procedures undertaken;

  • details of the steps taken to control and remediate the effects of the spill on the receiving environment; and

  • measures to be undertaken to prevent a recurrence.

• Soil contaminated with flocculant must be disposed of at a facility authorised to receive such material (which includes the York Landfill) and the NTRLBU must provide the Council's Monitoring Officer with written confirmation of disposal on request.

[RM975261 Sch 1 (44).]

• The NTRLBU must keep a record of the chemical treatment system, including:

  • the monitoring and maintenance undertaken, and

  • the volumes of flocculent used. [WN - Need to agree measurement.]

• The records must be provided to the Council's Monitoring Officer on request.

[RM975261 Sch 1 (45).]

• The discharges authorised by [RM975261 E & G] are limited to the following contaminants released to land and water during and following rainfall events:

  • Flocculant (when used in accordance with the CTMP); and/or

  • Sediment-laden water.

Any chemical treatment of the SRPs shown on the Drawing Number ESCP-001-01 Sheet 1 entitled ‘Erosion & Sediment Control Plan Site Upgrade’ (or any variations) and Plan number CE-043 entitled ‘York Valley Landfill Erosion and Sediment Control Sediment Retention Pond 3 Plan’ shall be undertaken in general accordance with the York Valley Landfill Chemical Treatment Management Plan (CTMP) prepared by Southern Skies and dated October 2020 (or subsequent variations prepared by a Suitably Qualified and Experienced Person – SQEP that have been be submitted to the Council’s Monitoring Officer for certification and are subsequently certified).

RM975261V2

The flocculant shall be applied and managed in accordance with the manufacturer’s instructions for use provided with the product and the CTMP referred to in condition 39 of this consent.

RM975261V2

All flocculants shall be stored securely in a locked shed or container.

RM975261V2

In the event of a spill of flocculant with the potential to enter a waterway or stormwater system the Consent Holder shall:

(a)        clean up the spill as soon as practicable, inspect and clean the spill area;

(b)       take all practicable measures to prevent a recurrence; and

(c)        inform the Council's Monitoring Officer within 24 hours of a spill event and provide the following information:

• (i)         the date, time, location and estimated volume of the spill;

  (ii)        the cause of the spill;

  (iii)      clean-up procedures undertaken;

  (iv)      details of the steps taken to control and remediate the effects of the spill on the receiving environment; and

  (v)        measures to be undertaken to prevent a recurrence.

RM975261V2

Any soil contaminated with flocculant as a result of a spill shall be disposed of at a facility authorised to receive such material (which includes the York Landfill) and the Consent Holder shall provide the Council's Monitoring Officer with written confirmation of such disposal on request.

RM975261V2

The Consent Holder shall keep a record of the chemical treatment system, including the monitoring and maintenance undertaken, and the volumes of flocculent used, which shall be provided to the Council's Monitoring Officer on request.

RM975261V2

The discharges authorised by RM975261 E and G (and their changes) is limited to the following contaminants released to land and water during and following rainfall events:

(a)        Flocculant (when used in accordance with the CTMP referred to in condition 40 and the other relevant conditions of this consent); and/or

(b)       Sediment-laden water.

RM975261V2

The discharge of the above contaminants shall only take place in accordance with existing resource consents RM975261 E and G (and any subsequent variations).

RM975261V2